diff --git a/TODO-RELEASE b/TODO-RELEASE
index 8ccfa49..d984813 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -7,3 +7,5 @@
 # If any interfaces have been added since the last public release: c:r:a + 1.
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library	what			description / commit summary line
+gsup		gsup.h				the 'osmo_gsup_message' struct extended with
+						session information => ABI changed